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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
So that's a no then - the Magellan Echo won't run Espruino with BLE (there is an Espruino port to the Gecko, but then you have to write your own BLE driver for the BLE chip).
Of course there's nothing to say that there isn't a newer version of the watch available.